本文關(guān)鍵詞： 濕地松 馬尾松 樹干呼吸 影響因素 亞熱帶退化紅壤區(qū)　出處：《南昌工程學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：樹干是森林生態(tài)系統(tǒng)最大的生物量?jī)?chǔ)存體,也是長(zhǎng)期而巨大的碳庫(kù)。樹木通過(guò)代謝呼吸向外界釋放CO2,可以消耗自身光合固定碳量的50%以上�，F(xiàn)有對(duì)樹干呼吸的研究主要集中在溫帶森林和熱帶森林,對(duì)亞熱帶退化森林的報(bào)道尚不多見。采用全自動(dòng)便攜式光合儀(LC PRO-SD,英國(guó)ADC公司)與自制PVC呼吸環(huán)在江西省泰和縣中國(guó)科學(xué)院千煙洲試驗(yàn)區(qū)對(duì)3個(gè)不同徑級(jí)29年生濕地松(17.9~22.9cm、23.6~26.8cm、27.5~32.5cm)、馬尾松(15.9~19.5cm、20.5~21.9cm、23.7~28.3cm)樹干呼吸速率進(jìn)行為期一年的觀測(cè),同時(shí)監(jiān)測(cè)多個(gè)相關(guān)環(huán)境因子。探討兩樹種樹干呼吸速率的個(gè)體差異及季節(jié)變化,同時(shí)探討樹干呼吸對(duì)樹干溫度的響應(yīng)情況,為正確評(píng)價(jià)南方亞熱帶退化紅壤區(qū)濕地松、馬尾松人工林對(duì)該地區(qū)生態(tài)系統(tǒng)碳收支的貢獻(xiàn),預(yù)測(cè)其在減緩全球變暖中的作用,以及構(gòu)建森林碳循環(huán)機(jī)理模型提供基礎(chǔ)數(shù)據(jù)和科學(xué)依據(jù)。結(jié)果如下:(1)濕地松樹干呼吸日變化基本呈單峰型曲線,與樹干溫度日變化較為一致,樹干呼吸對(duì)樹干溫度的響應(yīng)都存在1~2小時(shí)的時(shí)滯現(xiàn)象,各月份樹干呼吸一天當(dāng)中峰值出現(xiàn)在16:00-17:00,均值出現(xiàn)的時(shí)間在11:00-14:00和22:00-2:00。樹干呼吸與樹干溫度間存在良好的自然指數(shù)函數(shù)關(guān)系,樹干溫度可以解釋樹干呼吸日動(dòng)態(tài)的16.6%~43.1%,且非生長(zhǎng)季內(nèi)樹干呼吸對(duì)樹干溫度的變化更敏感。(2)在液流速率的上升期,生長(zhǎng)季和非生長(zhǎng)季各月樹干呼吸與液流速率均無(wú)明顯的相關(guān)關(guān)系(p0.05);在液流速率下降期,非生長(zhǎng)季樹干液流速率和樹干呼吸存在顯著的正相關(guān)關(guān)系(p0.05);在液流速率穩(wěn)定期,對(duì)不同生長(zhǎng)季樹干呼吸速率與樹干溫度進(jìn)行回歸分析顯示只有生長(zhǎng)季7月份在該時(shí)段的回歸模型優(yōu)于日變化的回歸模型。(3)濕地松和馬尾松樹干呼吸季節(jié)變化特征基本表現(xiàn)為單峰型模式,且季節(jié)變化差異顯著。樹干呼吸速率最高值均出現(xiàn)在7月份,最低值出現(xiàn)在1月份(馬尾松)、2月份(濕地松)。濕地松不同階級(jí)樹干維持呼吸所占比例為41.4%~53.8%,馬尾松為57.2%~67.8%,濕地松和馬尾松都表現(xiàn)為大徑級(jí)樹干維持呼吸顯著大于中、小徑級(jí)。(4)濕地松中徑級(jí)(23.6~26.8cm)樹干呼吸對(duì)樹干溫度的敏感性顯著高于大徑級(jí)(27.5~32.5cm)(p0.05),大徑級(jí)(27.5~32.5cm)高于小徑級(jí)(17.9~22.9cm)(p0.05)。馬尾松大(23.7~28.3cm)、中(20.5~21.9)徑級(jí)樹干呼吸對(duì)樹干溫度樹干呼吸對(duì)樹干溫度的敏感性顯著高于小徑級(jí)(15.9~19.5cm)(p0.05),而大徑級(jí)(23.7~28.3cm)和中徑級(jí)(20.5~21.9cm)之間無(wú)顯著差異(p0.05)。(5)濕地松及馬尾松樹干呼吸速率都表現(xiàn)為隨著徑級(jí)的增大而增大,樹干呼吸與胸徑間都呈極顯著的線性相關(guān)關(guān)系(P0.01),表明胸徑可以作為這2個(gè)樹種樹干呼吸預(yù)測(cè)和上推的一個(gè)簡(jiǎn)單而實(shí)用的指標(biāo)。
[Abstract]:The trunk is the largest biomass store in the forest ecosystem, It is also a long-term and huge carbon pool. Trees release CO _ 2 to the outside world through metabolic respiration, which can consume more than 50% of their own photosynthetic fixed carbon. The existing researches on trunk respiration mainly focus on temperate and tropical forests. There are few reports of subtropical degraded forest. Using the automatic portable photosynthetic apparatus LC PRO-SD (ADC Company, UK) and self-made PVC breathing ring in the Qianyanzhou Experimental area of the Chinese Academy of Sciences of Taihe County, Jiangxi Province, the results of 29 years of different diameter grades were studied. The trunk respiration rate of Pinus elliottii was measured for one year. The trunk respiration rate of Pinus elliottii was 23.6 ~ 26.8cm ~ (2. 5) ~ 32.5 cm ~ (-1), and that of Pinus massoniana was 15.9 ~ (19. 5) cm ~ (20. 5) ~ 21. 9 cm ~ (2. 7) cm ~ (28. 3 cm). At the same time, several related environmental factors were monitored. The individual difference and seasonal variation of tree trunk respiration rate were discussed, and the response of trunk respiration to trunk temperature was also discussed in order to correctly evaluate Pinus elliottii (Pinus elliottii) in south subtropical degraded red soil area. The contribution of Pinus massoniana plantations to the carbon budget of ecosystems in the region and its role in mitigating global warming, The results are as follows: (1) the diurnal variation of trunk respiration of Pinus elliottii is basically a single-peak curve, which is consistent with the diurnal variation of trunk temperature. The response of trunk respiration to trunk temperature has a delay of 1 or 2 hours. The peak value of trunk respiration in each month is 16: 00-17: 00, and the mean time is 11: 00-14: 00 and 22: 00-2: 00. there is a good natural exponential function relationship between trunk respiration and trunk temperature. The trunk temperature can explain the increasing period of sap flow rate of 16.6% and 43.1%, and the trunk respiration is more sensitive to the change of trunk temperature in non-growing season. There was no significant correlation between trunk respiration and sap flow rate in growing season and non-growth season, there was a significant positive correlation between stem sap flow rate and trunk respiration in non-growth season during the period of decreasing sap flow rate, and there was a significant positive correlation between sap flow rate and sap flow rate at stable stage of sap flow rate. The regression analysis of trunk respiration rate and trunk temperature in different growing seasons showed that the regression model of tree trunk respiration rate in July was better than that of diurnal variation on July. The seasonal variation of tree trunk respiration of Pinus elliottii and Pinus massoniana was better than that of diurnal variation. Basic performance is single-peak mode, The highest respiration rate of trunk appeared in July. The lowest value appeared on January (Pinus massoniana, Pinus elliottii, Pinus elliottii, Pinus elliottii) and Pinus elliottii (Pinus elliottii) in February, the proportion of trunk maintenance respiration in different classes of Pinus elliottii was 41.4%, 53.8%, 57.2% and 67.8% of Pinus massoniana, respectively. The sensitivity of trunk respiration to trunk temperature was significantly higher than that of large diameter (27.5g / 32.5cm), large diameter (27.5cm), large diameter (27.5cm) (27.922.9cm), p0.055.The diameter of Pinus massoniana was 23.728.3 cm / cm ~ (3), and (20.521.9)) the effect of trunk respiration on trunk temperature was higher than that of small diameter grade (17.922. 9 cm ~ 0.05cm). The sensitivity of Pinus elliottii and Pinus massoniana were significantly higher than those of small diameter grade (15.9 ~ 19.5cm ~ (-1) cm), while there was no significant difference between large diameter class (23.728.3 cm) and middle diameter grade (20.5 ~ 21.9 cm). (P < 0.05) the trunk respiration rate of Pinus elliottii and Pinus massoniana increased with the increase of diameter grade. There was a significant linear correlation between trunk respiration and DBH, indicating that DBH could be used as a simple and practical index to predict and push up trunk respiration of these two tree species.
【學(xué)位授予單位】：南昌工程學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S791.246;S791.248

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